Best Dive Knife under $50 Review in 2021

Dive Knife under $50 New divers more often than not undermine the importance of owning a good dive knife. Yes, you rarely will use the knife but when you use it, it will be a matter of life or death. You may not use the knife to fend off enemies beneath the waters but you will cut ropes lines vegetation and other things to get yourself free when trapped.

It is a very scary situation as unlike in swimming pools, no one can see you as the water is dark and you don’t have the luxury of calling for help. If you are new and get the opportunity to go on a guided dive,

you may not find the dive knife of use but it will still be a nice accessory especially events. If you are however an experienced diver and will be getting into heavy vegetation, shipwrecks caves, or unclear waters, a diver knife is a must-have.

So what is a good dive knife made of?

Well, you should understand that knives for diving are completely different from normal knives. This is because the knife is expected to work efficiently underwater when the diver has gloves on. For this reason, the following factors are important in a good dive knife.

Consider the tip of the knife. There are blunt as well as pointy tips available in the market. However, blunt tips are highly recommended, as you are less likely to stab yourself with them. In addition,

you are not going to stab anything underwater. Dive knives come in either titanium or stainless steel. The stainless steel used is either 400 or 300 series. The 300 stainless steel series is much more resistant to rust than the 400 series but it is softer.

Titanium knives on the other hand are for the most part rust proof as they do not contain any carbon. The downside to this is the fact that they chip easily. Titanium knives are however recommended as they are rustproof and since divers will use them mostly to cut through thick vegetation, the chipping should not be a big issue.

The blade of the knives is either non-serrated, serrated, or both. The non-serrated blades are efficient in cutting through natural things such as vegetation while serrated blades come in handy when cutting through non-manmade materials. Knives that have both of these blades should have a length that can accommodate both of them.

Speaking of length, these knives range from small, medium to large. However, despite their length, small knives can get the job done. They however have to have handles that are large enough to provide a firm grip with gloves on. Medium-sized dive knives are however best as they do not limit your mobility.

When you are purchasing a dive knife under $50,

find one that has a line cutter (this is a notch found on the knife that is designed to cut loose the fishing lines). Lastly, consider the sheath. It is very important as it secures your knife during diving. If it does not fit on your leg properly, do not use it lest it falls off and your diving adventure turns into a rescue mission. Apart from the factors above, most of these knives are the same.

1. Promate Scuba Dive knife under $50

The Promate Scuba Dive Snorkel Titanium Knife. The handle to this dive knife is firm and comfortable and its grips are very secure. The blade is made from titanium which makes it resistant to rust caused by the salty waters. It has a sheath that engages positively and releases easily. In addition, the sheath has adjustable straps to help fit firmly. And the fact that its blade is made from titanium makes it easy to maintain.

It is lightweight and therefore does not weigh you down when you are diving. One of the major advantages of this knife is that it is stronger and durable than most stainless steel knives. However, several customer reviews state that the fact that the blade is pointed makes it easier to stab oneself.


  • the handle is comfortable and simple to grasp
  • Really good value for a Titanium dive knife
  • a large variety of colors
  • Requires little to no maintenance


  • Needs a bit of a sharpen out of the box

2. McNett Saturna dive knife under $50

The McNett Saturna blunt tip outdoor and dive knife is a tool that has high-quality efficiency. It is made from a 400 series stainless steel and is, therefore, rust-resistant. One major advantage of this knife is the fact that it can be used for most outdoor activities including hunting kayaking rafting and many more. Its sheath has multiple attachment options and is design for quick release. In addition,

the knife completely disassembles which makes it easier to clean. It is available on Amazon in yellow color and a 3-inch length. The sheath and the knife however show a considerable amount of rust after diving in saline water.


  • Easy to use
  • High-Quality blade
  • easy cleaning
  •  Textured Grip
  • Looking Good


  • Handle is a bit short

3. Tusa Imprex dive knife under $50

TUSA Imprex sharp tip knife with holster dive knife is made from a high quality 420 stainless steel. It is easy to clean and maintain, as it can be disassembled completely. It also includes a blade with a serrated edge and a line cutter. It features a sheath that has a lock button to secure the knife.

It comes in shark silver colors and cobalt blue. However, one disadvantage of this knife is the fact that it can get unclipped from the straps and sink to the bottom of the water without your knowledge.


  • Construction feels sturdy and very high quality
  • Requires no/minimal maintenance
  • The quick release button works really well


  • The manual/instructions aren’t the most clear Can be easily

5. Riffe standard spearfisher’s dive knife under $50

Riffe standard spearfisher’s knife is a 4” blade of high quality and that is made from 420 stainless steel. Its overall length is 8”, which ensures that it provides, affirm grip. In addition, the knife comes with a sheath and leg straps made of rubber. To get this knife, you will have to part with just above 50$ from Amazon I would give it 3  stars as it needs more work to keep it rust-free. Find out more here


  • Very sharp
  • Straps hold well
  • good handle


  • The sheath needs a little bit of modification

6. Promate scuba diving knife under $50

The Promate scuba diving snorkeling sharp Tip stainless steel knife features a stainless steel cap on the bottom handle and has a blade made from 420 series stainless steel. The sheath is quick to release and has adjustable straps. The knife is easy to maintain and clean.

After use, however, be sure to rinse thoroughly with fresh water. However, given the fact that the sheath is ribbed on the inside hence making it uncomfortable as well as rusts pretty quick, I would give it 4  stars. Find out more here 


  • Can be easily disassembled for cleaning & maintenance
  • Very high quality for the price
  • Available as blunt or point tip and in a variety of colors


  • Some find the straps uncomfortable

What is a diving knife?

A diving knife is not a weapon. It is not for killing fish,  and of course, not for cut the air hoses of your underwater enemies (you are not James Bond!). It is a general tool and safety device. It is usually made by a metal handle butt, a smooth and serrated edge blade, and a mounting Sheath.

What does a diving knife use for?

Actually, they are plenty of uses for the knife. But the most important function is to set you free when you in case entangled by something (like fishing line, nets, seaweed, etc.). Although you wish the cases will never happen to you, there is a possibility that exists. In these cases, a diving knife can save your life.

Do I need to buy one?

As I  mentioned above, maybe you will use it once in your 1000 dives, but in the very one, it can save your life. It is just like you buy insurance but you will never have the chance to be served from it.

If I were you, I will buy this insurance, and buy one diving knife too. But if you want to dive into the big blue and meet the mermaid and Jacques, I will not stop you (I suggested you stay on the earth and enjoy the normal life…).

How to choose a good diving knife for myself?

You can buy one in the second-hand market and wish it will not be broken when you use it in the 1001 dive. Just joke. To make sure you will enjoy your 1002 dive, I suggest you choose a good one.

But since you’d better know more about which material, which shape, and which blade will be better for you, I will open another good topic to discuss more to let you make your right choice.

How To Choose The Best Dive Knife

Dive knives sometimes regarded as blades, shears, cutters, z knife, or zip knife are tools and not really weapons, thinking of a dive knife as a tool actually brings the concept into a whole new light. Basically,

a dive knife is a very important accessory of scuba diving that you will need not only to ensure your safety but also as prying, digging as well as a cutting tool while under the water,

plus dive knives can be used to untangle cords or underwater lines nets or seaweeds. Scuba dive knives or dive knives are very important underwater tools that offer versatile solutions to lots of underwater challenges.

Therefore, if you plan to do snorkeling, technical diving, wreck diving, or cave diving, one of the most important tools that you need to equip yourself with is simply a dive knife.

With so many choices of dive knives that come in different shapes and sizes in the market, it is very important to know the best dive knife tips in order to identify which diving knife is appropriate for you.

Therefore to narrow down on the best kind of dive knife that you require the following dive knife tips are necessary.

1.The tip of the knife

The tip of the blade is a very significant feature and a very important thing that one needs to consider when buying a dive knife. If for instance, you are diving for fun then you can employ a knife with a blunt tip.

Such kind of a knife can easily be mounted onto your equipment with less damage to it, secondly, there is less chance of one experiencing injuries or having accidents when diving with such a blunt tip knife. However, if you need to spear a fish then you certainly need to have a sharp knife.

2.The edge of the knife

The edge of the knife is also a very important feature that needs to be considered when acquiring a dive knife. There are two kinds of edges of a dive knife; straight and a serrated-edged dive knife.

A dive knife can either be with serrated or straight edges whereas some have a combination of both the serrated and straight edges. A knife designed with serrated edges is useful in cutting ropes and nets while the one with the straight edge can be very important in the cutting of fishing lines.

3. The type of the material

The type of material that a dive knife is made of is also a very important tip to consider. The most common materials are used are titanium and stainless steel.

Stainless steel is considered ass less expensive however it eventually corrodes from the salty water. On the other hand, the titanium knives are lighter and more rust-resistant, plus they tend to hold their edges much longer than the other materials

4. How a particular knife is mounted

How is the dive knife designed to be mounted? Some knives are designed in such a way that you can either mount them on your leg while others can easily be mounted onto their buoyancy compensator.

The choice of where to mount your knife determines its ease of removal and it should therefore be mounted in a place that you can reach it easily with your hands.

5. The sheath of the knife

One of the features that will also determine the kind of dive knife that you purchase is the sheath of the knife. The knife’s sheath helps to protect one from the knife’s blade.

It should be designed in a way that it can easily and smoothly slide onto the knife. It is important to look for a knife with a sheath that will allow you to release it from the dive knife with just one finger.

6. The size and the shape of the knife

Depending on what purpose and functionality that you want to serve with your dive knife. The size and the shape of a dive knife will play a very significant role whether a large, medium or mini dive will determine whether a knife is practical enough, easy to manipulate, and convenient enough to use.

The shape of the knife is also a factor that will determine its choice, is it convenient to carry or is it best suited for cutting, digging, chiseling, or prying without much difficulty.

Uses of Diving Knife

There are a lot of uses of a diving knife, let’s check the most six uses one by one.

1. set you free from the entangled case

This is the very first and most important use of a diving knife. In some cases, you may get caught in fishing lines, net, or seaweed. Of course, we hope it will never happen, but if it comes, a diving knife can slice or saw the things to set you free. A good knife offers both functions.

2. cause your buddy’s attention

In an emergency case underwater, use the metal handle butt of a diving knife bang against your tank to make noise that will travel far and fast underwater.

It is a great way to cause your buddy’s attention. In that case, your buddy comes and helps extract you, gives you air, and helps you to stay calm. This technique can literally save your life.

3. keep you stay still from the current

If you meet a sudden current nearby an underwater stone, stick your diving knife in the stone will be a way to keep you stay still and prevent the current move you far. But before going to somewhere with often current, you should prepare well your Current Hook.

4. prevent the underwater creatures hurt you

When you are searching for some creatures that may be covered by sands or sludge, you may want to remove the sands or sludge to check.

To prevent the creatures hurt you, you can use the diving knife instead of your hand to do this job. But be careful, don’t hurt the underwater creatures.

5. measure the size of underwater creatures

Light refraction underwater can make that small shell or crab look huge. Your 5-inch diving knife will be a good tool to measure if they are what you are looking for. Again declare, careful, don’t hurt them.

6. adjusting your gauges

BTW, the sixth use is to use your blunt tip head diving knife to adjusting your gauges, of course, when you don’t have the professional tool in hand.

Besides the above-listed six uses, the diving knife still can do a lot of things. But there are also don’t uses list you should pay attention don’t hurt the underwater creatures and human being careless.

What makes a good diving knife?

Dive knives come in either titanium or stainless steel. A dive knife is one of the most important tools that you need.

What steel are dive knives made of?

The stainless steel used is either 400 or 300 series. The 300 stainless steel series is much more resistant to rust than the 400 series but it is softer.

Are dive knives legal?

All things considered, a plunge blade truly isn’t pretty much as helpful as a line shaper and a couple of shears. What’s more, no legitimate worries with those. It is useless to get some information about criminal punishments without including the purview.

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